The main principles of the dow theory are (...)。I. Market average price indices can explain and reflect most market behaviourIi. A certain trend in market volatilityIii. Trends must be confirmed by the volume of transactionsIv. A trend will continue until a clear reversal of the trendI. Ii. IiiI. Ii. IvIi. Iii. IvI. Ii. Iii. IvThat is correct。High-quality answersIbidThese are the main principles of the dow theory. I. Market average